Unit ventilator control system



Feb. 1, 1938. w. P; MILLER 2,106,898

UNIT VENTILATOR CONTROL SYSTEM I Filed April 5, 1936 TO OTHER NIT VE NTl LATO R5 GROUND Straw-MI Patented Feb. 1, 1938 UNITED STATES UNITVENTILATOR CONTROL SYSTEM Wayland R. Miller, Chicago, Ill., assignor toMinneapolis-Honeywell Regulator Company, Minneapolis, Minn., acorporation of Delaware Application April 3, 1936. Serial No. 72,521

2 Claims.

This invention relates to control systems for unit ventilators.

It is an object of this invention to provide a control system for unitventilators wherein a plural- 8 ity of unit ventilators may be renderedoperative or inoperative from a remote point and wherein each unitventilator may be rendered operative or inoperative independently asdesired.

The specific manner in which this mode of operation is accomplished andthe structure utilized in accomplishing this mode of operation also formobjects of this invention.

Other objects and advantages will become apparent to those skilled inthe art upon references to the accompanying specification, claims anddrawing.

For a more thorough understanding of my invention, reference is made tothe accompanying single sheet of drawings in which is diagrammati- 20cally illustrated the preferred form of my invention.

A plurality of spaces to be conditioned and ventilated are designated atI! and in each of the spaces are located unit ventilators II which 25may be of the time shown and described in application Serial No. 44,899filed by John T. Midyette. Jr., on October 14, 1935. One of the unitventilators l i is shown in section for purposes of illustration. Theunit ventilators Ii may con- 30 tain heat exchangers II which may besupplied with conditioning fluid under the control of valves ii. Thedamper l4 regulates the amount of recirculated or return air and theamount of outdoor air supplied by the fans I! to the heat exchangers II.The fans Ware operated by a motor ii. The valves i3 and the mixingdamper i4 may be controlled by a proportionlng motor i8 in the mannerdescribed in the above referred to Midyette application. Power issupplied to the proportioning motor by a transformer It, the secondaryof. which is connected thereto by means of wires 2|. Each ventilator isprovided with terminals 44 and 45. One terminal each of the transformer.l! and'the fan I is connected to 45 terminal 44 through wires 35, 36and 31. The

other terminals of the transformer and fan are connected through wiresII, 3! and 4. to terminal 4|. I

Each unit ventilator II is provided with a single pole double throw snapswitch generally designated at 2i for placing the ventilators in or outof operation. Located in some convenient point. as in the basement, is asingle pole double throw master snap switch generally designated at 22.

The snap switch 22 may comprise a switch arm 23 adapted to engage spacedcontacts 24 and 25. Likewise, the snap switches 2i may comprise switcharms 26 adapted to engage spaced contacts 21 and 28.

A hot line 30 leading from a source of power, '5 not shown, is connectedto the switch arm 23 of the master snap switch 22. The contact 24thereof is connected by wires 3i and 32 to the contacts 28 of the snapswitches 2i associated with the unit ventilators ll. Likewise, the con-10 tact of the master snap switch 22 is connected by wires 33 and 34 tothe contacts 21 of the snap switches 2i of the unit ventilators l I. Theswitch arms 26 of the snap switches 2i are connected to the terminals44. The other terminals 45 are in 15 turn connected through wires 46 and4i to the ground line wire 42.

By reason of the above wiring connections when the switches 2i and 22are in the day" positions shown, the fan motors l6 and the transformersi9 are energized whereby the various unit ventilators ii are controlledin the manner disclosed in the above referred to Midyette application;At night the attendant in charge of the particular building moves theswitch arm 22 from engagement with 25 the day contact 24 into engagementwith the night" contact 25. This breaks the power circuits to thevarious unit ventilators H and the unit ventilators ii are then renderedinoperative for the night.

If an occupant of any space or room wishes to have the unit ventilatorii of that room in operation during the night, he moves the switch arm26 from the day" contact 28 into engagement with the night contact 21whereby the 5 power circuit to the unit ventilator ll of that space iscompleted to cause operation of that unit ventilator. When the occupantof the room no longer wants the unit ventilator in operation diu'ing thenight time, he moves the switch arm 26 out of engagement with the night"contact 21 and into engagement with the day" contact 28 to stopoperation of that unit ventilator and to condition that unit ventilatorfor operation in the morning when the switch arm 23 of the master snapswitch 22 is moved from engagement with the night contact 25 intoengagement with the "day contact 24.

that room again desires to have the unit ventilator ll of that roomplaced in operation, he moves the switch arm 26 out of engagement withthe night contact 21 and into engagement with the day contact 28whereupon the unit ventilator l l is again rendered operative.

From the above it is seen that I have provided a control system for unitventilators wherein all of the unit ventilators may be controlled from aremote point and wherein each unit ventilator may be controlledindependently as desired.

Although I have shown one form of my invention for purposes ofillustration, other forms thereof may become obvious to those skilled inthe art and consequently this invention is to be limited only by thescope of the appended claims and prior art.

I claim as my invention:

1. In a system of the class described, a plurality of unit ventilatorsfor a plurality of spaces, each of said unit ventilators includingconditioning, ventilating and control means, a single pole double throwswitch associated with each unit ventilator, a master single pole doublethrow switch, a pair of line wires for supplying electrical energy tosaid unit ventilators, a first of said line wires being connected to theswitch arm of the master switch and the second of said wires beingconnected to the ventilating and control means of each unit ventilator,connections between the contacts oi the master switch and the contactsof each switch associated with said unit ventilators, and connectionsbetween the ventilating and control means and the switch arm oi. theswitch associated with that unit ventilator whereby the unit ventilatorsmay be controlled by the master switch and by the switches associatedtherewith.

2. In a system of the class described, a plurality of unit ventilators,a single pole double throw switch associated with each unit ventilator,a master single pole double throw switch, a pair of line wires forsupplying electrical energy to said unit ventilators, one of said linewires being connected to the switch arm of the master switch and theother of said line wires being connected to the unit ventilators,connections between the contacts of the master switch and the contactsof each switch associated with said unit ventilators, and connectionsbetween each unit ventilator and the switch arm of the switch associatedtherewith whereby the unit ventilators may be controlled by the masterswitch and by the switches associated therewith.

WAYLAND R. MILLER.

